ZIP Code 57003 — Baltic, SD
57003 is a standard (street delivery) ZIP code serving Baltic, South Dakota, in Minnehaha County. To mail something here you only need these five digits — but the four-digit extension narrows delivery to a single point, and it is what USPS bulk postage discounts are priced on.
ZIP code 57003 at a glance
| ZIP code | 57003 |
|---|---|
| Primary city | Baltic |
| State | South Dakota (SD) |
| County | Minnehaha FIPS 46099 |
| ZIP type | Standard (street delivery) |
| Time zone | America/Chicago |
| Population | 2,274 |
| Coordinates | 43.737050, -96.757840 |
How ZIP+4 works in 57003
The four digits after the hyphen encode a delivery segment inside 57003. In practice one segment usually means:
- One side of one block — odd numbers on a street between two cross streets
- A single large building, or one floor of it
- A group of PO boxes, sometimes a single box
- A single business that receives enough mail to warrant its own code
That is why 57003 has no single ZIP+4: two neighbors across the street from each other usually have different ones. Enter a street address above and we will return the exact nine-digit code along with the standardized USPS address format.
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 57003.
| ZIP | City | Distance |
|---|---|---|
| 57055 | Renner, SD | 5 mi |
| 57020 | Crooks, SD | 5.3 mi |
| 57041 | Lyons, SD | 6.4 mi |
| 57022 | Dell Rapids, SD | 7.9 mi |
| 57104 | Sioux Falls, SD | 9.6 mi |
| 57107 | Sioux Falls, SD | 10.3 mi |
| 57030 | Garretson, SD | 11.1 mi |
| 57018 | Colton, SD | 11.8 mi |
| 57005 | Brandon, SD | 13.1 mi |
| 57033 | Hartford, SD | 13.1 mi |
| 57065 | Trent, SD | 13.6 mi |
| 57103 | Sioux Falls, SD | 14.1 mi |
Questions about 57003
What is the ZIP+4 code for 57003?
57003 is the five-digit ZIP code. The ZIP+4 adds four more digits that identify a specific delivery point — usually one side of a city block, a single building, or a group of PO boxes. Because those four digits change from address to address within 57003, you need to look up a specific street address to get them.
What city is 57003?
57003 is assigned to Baltic, South Dakota, in Minnehaha County.
Do I need to use the ZIP+4?
It is optional for ordinary mail, but it speeds up sorting and it is required for most USPS bulk-mail postage discounts. Many address-verification and e-commerce systems also use ZIP+4 to confirm a delivery point exists.
Need thousands of these?
Upload a CSV and get ZIP+4, county, carrier route, and delivery-point data appended to every row — or call the API directly.